What Is OpenGL?
OpenGL is a Graphics rendering API which is operating system independent, window system independent and has high-quality color images composed of geometric and image primitives. OpenGL APIs can use following -
- GL
- OpenGL API implementation (http://www.opengl.org)
- GLU
- OpenGL Utility
- Glut
- GLUT (OpenGL Utility Toolkit) – Glut is portable windowing API and it is not officially part of OpenGL.
- OpenGL Utility Toolkit (http://www.opengl.org/resources/libraries/glut/)
- FLTK
- FlashLight ToolKit (http://www.fltk.org/)
- GLEW
Now lets see how to install OpenGL in Ubuntu.
Now because GLUT (OpenGL Utility Toolkit) depends upon OpenGL and a number of other related libraries, if we install GLUT then OpenGL will be automatically be installed.
First update the repository using the given command
$ sudo apt-get update
Run the following command to install OpenGL.
$ sudo apt-get install libglu1-mesa-dev freeglut3-dev mesa-common-dev
Now to test if OpenGL libraries are working fine on our Linux machine, we will create a C++ program and test it.
So create a following C++ Program.
#include <GL/glut.h>
void displayMe(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_POLYGON);
glVertex3f(0.5, 0.0, 0.5);
glVertex3f(0.5, 0.0, 0.0);
glVertex3f(0.0, 0.5, 0.0);
glVertex3f(0.0, 0.0, 0.5);
glEnd();
glFlush();
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE);
glutInitWindowSize(400, 300);
glutInitWindowPosition(100, 100);
glutCreateWindow("Hello world!");
glutDisplayFunc(displayMe);
glutMainLoop();
return 0;
}
Now give the command below to compile your code.
$ g++ main.cpp -o firstOpenGlApp -lglut -lGLU -lGL
Now run your OpenGl program with following command
$ ./firstOpenGlApp
You will see something like this on your screen if everythings went well.
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